// Called when the UI object representing a SelectionStop gets clicked:
//
// * If this is a double-click and the SelectionStop can be expanded / collapsed,
// expand / collapse the SelectionStop
//
private static void OnSelectionStopDoubleClickTargetMouseDown(object sender, MouseButtonEventArgs e)
{
DependencyObject target = e.OriginalSource as DependencyObject;
if (target == null)
{
return;
}
if (e.ClickCount > 1)
{
FrameworkElement parentSelectionStopVisual = PropertySelection.FindParentSelectionStop <FrameworkElement>(target);
if (parentSelectionStopVisual != null)
{
ISelectionStop parentSelectionStop = PropertySelection.GetSelectionStop(parentSelectionStopVisual);
if (parentSelectionStop != null && parentSelectionStop.IsExpandable)
{
parentSelectionStop.IsExpanded = !parentSelectionStop.IsExpanded;
}
}
}
}
// Helper method that returns false if the given element is a collapsed SelectionStop,
// true otherwise.
//
private static bool IsExpanded(DependencyObject element)
{
ISelectionStop selectionStop = PropertySelection.GetSelectionStop(element);
return(selectionStop == null || selectionStop.IsExpanded);
}